PCI4410A Datasheet, PDF (81/198 Pages) Texas Instruments – PC CARD AND OHCI CONTROLLER

4.30 General Status Register
The general status register provides the general device status information. The status of the serial EEPROM interface
is provided through this register. See Table 4–8 for a complete description of the register contents.
Bit
7
Name
Type
R
Default
0
Register:
Type:
Offset:
Default:
6
5
R
R
0
0
General status
Read/Clear, Read-only
85h (Function 0)
00h
4
3
General status
R
R
0
0
2
1
0
R
R/C
R
X
0
0
Table 4–8. General Status Register Description
BIT
SIGNAL TYPE
FUNCTION
7–3
RSVD
R Reserved. Bits 7–3 return 0s when read.
Serial EEPROM detect. Serial EEPROM is detected by sampling a logic high on SCL while PRST is low.
2
EEDETECT
R
When this bit is set, the serial ROM is detected. This status bit is encoded as:
0 = EEPROM is not detected (default).
1 = EEPROM is detected.
Serial EEPROM data error status. This bit indicates when a data error occurs on the serial EEPROM
1
DATAERR
R/C
interface. This bit may be set due to a missing acknowledge. This bit is cleared by a writeback of 1.
0 = No error is detected (default).
1 = Data error is detected.
Serial EEPROM busy status. This bit indicates the status of the PCI4410A serial EEPROM circuitry. This
0
EEBUSY
R
bit is set during the loading of the subsystem ID value.
0 = Serial EEPROM circuitry is not busy (default).
1 = Serial EEPROM circuitry is busy.
4.31 General Control Register
The general control register provides top-level PCI arbitration control. See Table 4–9 for a complete description of
the register contents.
Bit
7
6
5
4
3
2
1
0
Name
General control
Type
R
R
R
R
R/W
R
R/W
R/W
Default
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
General control
Read-Only, Read/Write
86h
00h
Table 4–9. General Control Register Description
BIT
SIGNAL
TYPE
FUNCTION
7–4
RSVD
R Reserved. Bits 7–4 return 0s when read.
3 DISABLE_OHCI R/W When bit 3 is set, the open HCI 1394 controller function is completely nonaccessible and nonfunctional.
2
RSVD
R Reserved. Bit 2 returns 0 when read.
Controls top-level PCI arbitration.
00 = 1394 open HCI priority
1–0
ARB_CTRL
R/W
01 = CardBus priority
10 = Fair round robin
11 = Reserved (fair round robin)
4–19